Finding the Fourth Proportional to 82.74, 124.15 and 28.61

Step by Step Solution

1. Step 1: Write the proportion equation
   82.74 : 124.15 = 28.61 : x
2. Step 2: Convert to fraction form
   82.74/124.15 = 28.61/x
3. Step 3: Cross multiply
   82.74x = 124.15 × 28.61
4. Step 4: Simplify right side
   82.74x = 3,551.93
5. Step 5: Solve for x
   x = 3,551.93/82.74
6. Step 6: Final answer
   x = 42.93